Pentagonal Gyrobicupola
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Johnson Solid 
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- Diophantus' Riddle
- Dipyramid
- Dirac Delta Function
- Dirac Matrices
- Dirac's Theorem
- Directed Angle
- Directed Graph
- Directional Derivative
- Direction Cosine
- Directly Similar
- Director Curve
- Direct Product (Group)
- Direct Product (Matrix)
- Direct Product (Set)
- Direct Product (Tensor)
- Directrix (Conic Section)
- Directrix (Graph)
- Directrix (Ruled Surface)
- Direct Search Factorization
- Direct Sum (Module)
- Dirichlet Beta Function
- Dirichlet Boundary Conditions
- Dirichlet Conditions
- Dirichlet Divisor Problem
- Dirichlet Energy